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Abstract Firstly，scale effect on instantaneous deformation of rockfill is studied by experimental data in former studies and numerical tests base on stochastic granule discontinuous deformation(SGDD) model. It is demonstrated that larger specimen shows higher shear strength and initial modulus of elasticity under the same axial stress and confining pressure without considering creep deformation of rockfill. Secondly，two kinds of specimens with different sizes(f50 cm×100 cm(maximum grain diameter is 10 cm) and f30 cm×60 cm(maximum grain diameter is 6 cm)) are subjected to stress control triaxial creep tests，which aim to study the scale effects on creep deformation of rockfill. It reveals that scale effect has significant influence on creep property of rockfill. Larger specimens give more creep deformation，but no clear law is found about the scale effect on the factor of creep rate . Finally，based on the synthetical analysis of scale effect on total deformation including instantaneous and creep deformations of rockfill，the total deformation of big specimen is larger than that of the small one as a whole.
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Received: 17 July 2009
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